Help to realise function
Hi all,
Can anyone offer suggestions on how to realise this function....
It is the $1 as the table name that is the problem.
I'm using Version 7.4.5
create or replace function last_scan( varchar, varchar ) returns float as '
declare
result float;
begin
result := value from $1 where parameter = $2 order by dt desc limit 1;
return result;
end;
' LANGUAGE plpgsql;
Thanks
Allan
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On Mon, 3 Apr 2006 14:57:14 +1000, "Harvey, Allan AC" <HarveyA@OneSteel.com> wrote:
Hi all,
Can anyone offer suggestions on how to realise this function....
It is the $1 as the table name that is the problem.
I'm using Version 7.4.5
create or replace function last_scan( varchar, varchar ) returns float as '
declare
result float;begin
result := value from $1 where parameter = $2 order by dt desc limit 1;return result;
end;
' LANGUAGE plpgsql;
try executing the query
declare
r record;
begin
for r in execute 'select value from '||quote_ident($1)||' where
parameter = '||quote_literal($2)||' order by dt desc limit 1' loop
return r.value;
end loop;
return null;
end;
klint.
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